using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;namespace WindowsApplication6
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Button button1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null; public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent(); //
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(80, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(32, 23);
this.label1.TabIndex = 0;
this.label1.Text = "学号";
//
// label2
//
this.label2.Location = new System.Drawing.Point(80, 56);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(32, 23);
this.label2.TabIndex = 1;
this.label2.Text = "密码";
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(112, 16);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 2;
this.textBox1.Text = "textBox1";
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(112, 56);
this.textBox2.Name = "textBox2";
this.textBox2.TabIndex = 3;
this.textBox2.Text = "textBox2";
//
// button1
//
this.button1.Location = new System.Drawing.Point(112, 96);
this.button1.Name = "button1";
this.button1.TabIndex = 4;
this.button1.Text = "登陆";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(512, 422);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void button1_Click(object sender, System.EventArgs e)
{
string source="server=king;uid=sa;pwd=853205;database=northwind";
SqlConnection conn=new SqlConnection(source);
conn.Open();
SqlCommand cmd=new SqlCommand("loginp",conn);
cmd.CommandType=CommandType.StoredProcedure;
SqlParameter sp1=new SqlParameter("@logid",SqlDbType.NVarChar,50);
cmd.Parameters.Add(sp1);
cmd.Parameters[0].Value=textBox1.Text;
SqlParameter sp2=new SqlParameter("@password",SqlDbType.NVarChar,50);
cmd.Parameters.Add(sp2);
cmd.Parameters[1].Value=textBox2.Text;
SqlParameter sp3=new SqlParameter("@loginresult",SqlDbType.Int);
//cmd.Parameters.Add(sp3);
sp3.Direction=ParameterDirection.Output;
if((int)(sp3.Value)==1)
{
MessageBox.Show("您输入的学号不正确!!!!");
textBox1.Focus();
textBox1.SelectionStart.ToString();
textBox1.SelectionLength=textBox1.Text.Length;
}
else if((int)(sp3.Value)==2)
{
MessageBox.Show("您输入的密码不正确!!!!!!");
textBox2.Focus();
textBox2.SelectionStart.ToString();
textBox2.SelectionLength=textBox1.Text.Length;
}
else
MessageBox.Show("登陆成功!!!!!"); conn.Close();
}
}
}
未处理的异常: System.NullReferenceException: 未将对象引用设置到对象的实例。
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;namespace WindowsApplication6
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Button button1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null; public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent(); //
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(80, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(32, 23);
this.label1.TabIndex = 0;
this.label1.Text = "学号";
//
// label2
//
this.label2.Location = new System.Drawing.Point(80, 56);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(32, 23);
this.label2.TabIndex = 1;
this.label2.Text = "密码";
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(112, 16);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 2;
this.textBox1.Text = "textBox1";
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(112, 56);
this.textBox2.Name = "textBox2";
this.textBox2.TabIndex = 3;
this.textBox2.Text = "textBox2";
//
// button1
//
this.button1.Location = new System.Drawing.Point(112, 96);
this.button1.Name = "button1";
this.button1.TabIndex = 4;
this.button1.Text = "登陆";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(512, 422);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void button1_Click(object sender, System.EventArgs e)
{
string source="server=king;uid=sa;pwd=853205;database=northwind";
SqlConnection conn=new SqlConnection(source);
conn.Open();
SqlCommand cmd=new SqlCommand("loginp",conn);
cmd.CommandType=CommandType.StoredProcedure;
SqlParameter sp1=new SqlParameter("@logid",SqlDbType.NVarChar,50);
cmd.Parameters.Add(sp1);
cmd.Parameters[0].Value=textBox1.Text;
SqlParameter sp2=new SqlParameter("@password",SqlDbType.NVarChar,50);
cmd.Parameters.Add(sp2);
cmd.Parameters[1].Value=textBox2.Text;
SqlParameter sp3=new SqlParameter("@loginresult",SqlDbType.Int);
//cmd.Parameters.Add(sp3);
sp3.Direction=ParameterDirection.Output;
if((int)(sp3.Value)==1)
{
MessageBox.Show("您输入的学号不正确!!!!");
textBox1.Focus();
textBox1.SelectionStart.ToString();
textBox1.SelectionLength=textBox1.Text.Length;
}
else if((int)(sp3.Value)==2)
{
MessageBox.Show("您输入的密码不正确!!!!!!");
textBox2.Focus();
textBox2.SelectionStart.ToString();
textBox2.SelectionLength=textBox1.Text.Length;
}
else
MessageBox.Show("登陆成功!!!!!"); conn.Close();
}
}
}
未处理的异常: System.NullReferenceException: 未将对象引用设置到对象的实例。
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sp1.Value=textBox1.Text;
cmd.Parameters.Add(sp1);